TRIBE VII. HYLESININI. 663 



&&. Antennal club oval, annulated, not compressed. 



c. First, second and fifth ventral segments subequal, third and fourth 

 shorter; front coxae widely separated. 



d. Club with first and second segments subequal, each as long as 



third and fourth united. (Fig. 137, D.) II. HYLASTINUS. 



dd. Club with first segment much longer than second, nearly as long 



as second, third and fourth united. III. SCIERUS. 



cc. First and fifth ventral segments longer than others; front coxae 



narrowly separated or contiguous. 



e. Mesosternum protuberant; third joint of tarsi dilated and bi- 



lobed; elytra separately rounded at base. IV. HYLURKOPS. 



ee. Mesosternum not protuberant; third joint of tarsi about as wide 



as second, emarginate; bases of elytra in a straight line, not 



separately rounded. V. HYLASTES. 



I. HYLESINUS Fabr., 1801. (Gr., "woods" -f- ''scourge.") 

 The few species which we have are readily distinguished by 



the elytral pattern formed by the scales, being the only ornate 



species in the family. 



KEY TO EASTERN SPECIES OF HYLESINUS.* 



a. Bands of elytra oblique. 1072. ACULEATUS. 



aa. Bands of elytra transverse. 1073. FASCIATUS. 



1072 (9163). HYLESINUS ACULEATUS Say, 1823, 322; ibid, II, 181. 



Cylindrical, elongate. Blackish-brown, thickly clothed with very short, 

 ashy, squamiform hairs; thorax with side margins and a large spot on 

 middle, and elytra with fifth interval from base to middle, blackish-brown; 

 the color is then divided into two branches and prolonged obliquely to 

 suture; humeri ferruginous as are also the antenna? and legs. Beak with 

 groove, less developed than in preceding genera. Antennae with 4-jointed 

 club which is very slightly compressed, annulated, uniformly finely pubes- 

 cent, oval-pointed. Head visible from above, more flattened in male, with 

 large, transverse, finely granulated eyes. Elytra with rows of small, acute 

 tubercles on intervals, visible, however, only in abraded specimens. Ven- 

 tral segments convex, nearly equal, first and fifth somewhat longer, 

 sutures deep and straight. Tibia? dilated, serrate on outer margin; third 

 joint of tarsi deeply bilobed. Length 2.2 3.4 mm. 



Steuben, Marion, Yigo and Crawford counties, Tnd.. scarce; 

 March 31 July 4 ; taken on the wing in early spring. Swarth- 

 more, Pa., June. (Wenzcl.) Stonington, Conn., May 14. Occurs 

 in Canada and United States from Atlantic to Pacific. Food 

 plant, ash, (Fraatinus). Dr. Hopkins states that this species ex- 

 cavates two long, transverse galleries from a central entrance 

 burrow and side cavity on the living bark of injured, dying or 

 felled ash trees, mining also under green bark of logs, stumps and 

 dying trees. In West Virginia adults were noted June 20, July 



*H. fraxini Panz., cited by Hagedorn (1910), and H. impcrialis Eich., cited by 

 LeConte from Georgia and by Swaine from New York are omitted for lack of confirma- 

 tion. H. ofacuhis Lee. is a synonym of Hylurgops rufipes. The name Ptcleobius is 

 used in Europe for Hylesinus. 



